28/02/2015

-          Removing short-circuit bar complete

-          5h00 Back energized (Problems with 400 kV line – ESKOM)

-          Turbine @ 3000 RPM expected 9h30

27/02/2015

-          Electrical test was stopped 23h00 yesterday due to several boiler trips (HP by-pass)

-          6h30 Turbine @ 3000 RPM

-          Electrical tests ongoing

-        12:00 Short circuit test complete

-          Removing short-circuit bar by ESKOM ongoing

-          Open circuit tests forecast : 18h00

26/02/2015

Turbine at 3000 RPM forecasted tonight 18h00!
  2h45 CT replacement complete
3h00 Aux boiler started

-          8h00 boiler filling

-          10h00 Boiler must be drained due to high conductivity

-          15h00 Boiler start
16h00 : boiler 20 burners on
           : steam water cycle in by-pass operation (waiting for water and steam quality)
17h50 Turbine start

-          18h00 Turbine @ 3000 RPM – ready for electrical test

 20h00: Boiler trip; HP by-pass issue.

Several attempts to restart the boiler were performed unsuccessfully.

23h00: Hitachi investigating..

25-02-2015

Shut-Down to replace faulty Generator CT
from 25/02/2015 to 26/02/2015

CT Replaced on 25/02/2015 @24:00

Boiler Re-Start @ 3:00

2015/02/24

-         6h00 Excitation panel repaired and ready

-         7h45 Turbine @ 3000 RPM

-         8h00 Start of electrical test – Excitation 20%

-         14h00 One CT on neutral point is unbalanced and protection relays are tripping

-         15h00 Excitation test on short-circuit complete (Excitation up to 80%)

-         18h30 CT issue still under investigation

2015/02/23

06:00 - ST on Baring
ST Turning on Steam
06:07 - STG @3000RPM
  6h30 Start of electrical test
06:56 - Boiler Tripped on Boiler Protection - FO Lost
Expected restart 12h00
11:53 - Mill 20 in service
 12h00 Boiler started, system in by-pass operation
12:20 - ST Turn on Steam
12h25 Turbine @ 3000 RPM
12h30 Ready for electrical test (Excitation)
14h00 Excitation panel test (10% load)  
15h00 Excitation panel trip (one relay burned) - Burned relay will be replaced by Unit 5 relay

17:26 - Steam turbine OVERSPEED TEST and Tripped on 3300RPM

 18:34 - ST on Turning Gear
01:00 - Boiler Fires In
02:45 - Attempt to bring Mill30 in - Failed
03:45 - Fires Out - Loss of Aux boilers
05:05 - Fires In
05:25 - By-Pass Operation